package atom

import (
	"encoding/xml"
	"fmt"
)

type ExtensionElement struct {
	Value   any `xml:",innerxml"`
	XMLName xml.Name
}

// NewExtensionElement creates a new ExtensionElement. It returns a
// *ExtensionElement.
func NewExtensionElement(name string, value any) *ExtensionElement {
	return &ExtensionElement{XMLName: xml.Name{Local: name}, Value: value}
}

// Check checks the ExtensionElement for incompatibilities with RFC4287. It
// returns an error.
func (e *ExtensionElement) Check() error {
	if e.XMLName.Local == "" {
		return fmt.Errorf("xml name of extension %v empty", e)
	}

	if e.Value == nil {
		return fmt.Errorf("value of extension %v empty", e)
	}

	return nil
}